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Electroencephalographic Terms

Harriet S. Meyer

,(pp12-34),,,,,Guidelines for electroencephalography (EEG) are available through the American Clinical Neurophysiology Society (formerly the American Electroencephalographic Society; http://www.acns.org) and at the International Federation of Clinical Neurophysiology website (IFCN; http://www.ifcn.info; formerly the International Federation of Societies for Electroencephalography and Clinical Neurophysiology). The International 10 20 System specifies placement of electrodes used in electroencephalography. The 10 20 System, which originated in the 1950s,, is so named because electrodes are spaced 10% or 20% apart along the head (Figure ). The terms used in the 10 20 System are widely used and recognized. They are systematically derived, as follows: ▪ Letters refer to

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